**Core Concept**
The linear coefficient of expansion is a measure of how much a material expands or contracts when its temperature changes. In medical contexts, this is particularly relevant for materials used in implants, surgical instruments, and medical equipment, where thermal stability is crucial.

**Why the Correct Answer is Right**
The linear coefficient of expansion is typically denoted by the symbol α. It is defined as the change in length per unit length per degree change in temperature. Different materials have varying values of α due to their unique atomic and molecular structures. In general, materials with weaker intermolecular forces exhibit larger coefficients of expansion. For example, materials with van der Waals forces, such as plastics and metals, tend to have larger α values compared to materials with strong covalent bonds, like glass and ceramics.

**Why Each Wrong Option is Incorrect**
* **Option A:** This material has a relatively low coefficient of expansion due to its strong covalent bonds and rigid crystal structure.
* **Option B:** This material exhibits a moderate coefficient of expansion, but its value is not the highest among the options.
* **Option D:** This material has a relatively high coefficient of expansion due to its weak intermolecular forces, but it is not the highest among the options.

**Clinical Pearl / High-Yield Fact**
When selecting materials for medical implants or equipment, it's essential to consider their thermal expansion properties to ensure they do not undergo significant changes in size or shape with temperature fluctuations.

**Correct Answer: C. Titanium has a high linear coefficient of expansion.**